Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It discloses that the RSVP is not immediate, that a confirmation email is sent, and that the link expires in 24 hours. It also states the confirmation link is not returned to the agent. This covers key behavioral traits beyond the basic function.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is three sentences, extremely dense with information. It starts with the core purpose, then adds critical behavioral notes and user instructions. Every sentence earns its place with no redundancy or fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has 4 required params, no output schema. The description covers the key workflow (email confirmation, no guest list initially, link expiry). It does not explain return values, but the confirmation process is well-described. For a simple RSVP tool, it is mostly complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the schema already documents each parameter. The description adds slight context: for email, it says 'the confirmation link is sent here'; for event_slug, it says 'from list_events'. But firstName and lastName descriptions are minimal. Overall, the description adds marginal value beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'RSVP' and the resource 'free event on this site (Wix Events)'. It distinguishes from siblings like 'reserve_event_tickets' by specifying 'free event' and mentions 'Wix Events' which aligns with other event tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance: the RSVP is not immediate, requires email confirmation, and the agent should tell the user to check their inbox. It also advises using a real address belonging to the person the agent is acting for. However, it doesn't explicitly state when not to use this tool (e.g., for paid events), which is implied by 'free event'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.